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Let's say I have two materials "material1" and "material2". How do I achieve that material1's roughness(or anything else) is the same as material2's and changing material2's roughness will change both?

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I think the easiest way to do this - is using node-groups. This is instruction:

  1. Add a node with your parameter for roughness it will be Value node:

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  1. Select your node than press Ctrl+G. It will create a node group with output from value node:

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  1. To exit from node-group press Tab and connect node group to roughness socket.

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  1. In N-pannel you can change name to any that you like:

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  1. And finally, in outer material nodes you can add same node-group from Add(Shift+A)->Group menu.

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  1. New node will have number near node-group name. It indicates how many copies of this node-group you use.

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